OPTIC is a highly advanced Gas Chromatograph multi mode inlet system with sophisticated temperature and
gas flow control that can be used for the most demanding GC analyses. The current version OPTIC-4 can be used
for hot injections, cold injections, large volume, on-column injections, in liner derivatisation,
thermal desorbtion, pyrolysis and more. Go to OPTIC page...

GL Sciences GC/GCMS columns made in Japan.

GL Sciences InertCap GC and GCMS Columns are designed and manufactured in Japan and
offer the lowest bleed levels, the best inertness for acids/bases/mixed functional compounds,
and the tightest column-to-column reproducibility.

GL Sciences LC columns

GL Sciences Inertsil, InertSustain and MonoCap Columns are designed and manufactured in Japan and
offer the lowest bleed levels, the best inertness for acids/bases/mixed functional compounds,
and the tightest column-to-column reproducibility.

GL Sciences has a wide range of sample preparation products that is produced in Japan. The available products are based on our in house technologies like monolithic technology, deactivation and chemical bonding.

QuEChERS Kits

EN 15662 Method
AOAC 2007.01 Method

QuEChERS Kits

QuEChERS is an acronym for Quick, Easy, Cheap, Effective, Rugged and Safe which exactly
explains its purpose. The kit makes the process of detecting pesticides in food samples
easier and faster. It has become a common knowledge that pesticides influence the health
of people. Different regulations all over the world make it important for the food industry to
detect the different pesticides used on their import products. Therefore the QuEChERS kit
was developed in 2003 and have become more important ever since.

How do they work?
The functionality of the QuEChERS kit is to extract any interfering matrices from the sample.
The first step (explained on the next page) transfers the pesticides from the water to the
added acetonitrile phase by applying MgSO4.
Lipids, sugars and pigments are the most important interfering matrices. The second step
gets rid of these. Again MgSO4 is added to separate any water. PrimarySecondaryAmine removes
fatty acids and sugars, GraphiteCarbonBlack removes pigments and sterols. C18 makes sure that the
pesticides do not dissolve in the lipid layer that arises in fat fruits and vegetables (sample >
1% fat).
The extraction can be done after homogenizing 10 grams of the sample. When working with
dried fruits, add some water before homogenizing. Apply the sample to the provided 50 mL
test tubes for the first step. Starting the second step can be done by applying the aliquot
supernatant to the provided 2 mL or 15 mL centrifuge tubes.

What QuEChERS kit to use?
On the next page one can find the Buffered Extraction Kits. Pay attention to choosing the
correct one for the international market you're producing for (either EU or USA).
On the back of this folder a list of QuEChERS kits can be found with a description on what
fruits and vegetables they should be used with. Again observe the EU and USA method being
displayed.
Using the wrong QuEChERS kit can lead to a contaminated chromatogram as well as a
contaminated column. Make sure you do know what matrices inside the fruits you are
dealing with.